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SM830078
12. SERVICE PROCEDURES
Single-phase outdoor unit
1
2
G
4
1
2
4
G
L1
L2
G
Indoor Unit Outdoor Unit
Power supply
Ground
B
A
1089_M_I
Ground
Inter-Unit
Wiring
(Line voltage)
Disconnect SW
(Field supply)
Fig. 12
(1) Troubleshooting
1) Check before and after Troubleshooting
Many problems may happen because of wiring or power supply problems, so you
should check these areas first. Problems here can cause false results in some of
the other tests, and so should be corrected first.
11
11
1 Check power supply wiring
(a) Single-phase
❑ Check that power supply wires are correctly connected to terminal No. 1
through No. 4 on the 4P terminal plate in the indoor unit and L1 and L2 on
the 6P terminal in the outdoor unit.
22
22
2 Check inter-unit wiring
❑ Check that inter-unit control wiring (AC 230 - 208 V Line voltage) is cor-
rectly connected between the indoor unit and outdoor unit.
33
33
3 Check power supply
❑ Check that voltage is within the specified range (±10 % of the rating).
❑ Check that power is being supplied.
If the following troubleshooting must be done with power being supplied, be
careful not to touch any uninsulated live part that can cause ELECTRIC
SHOCK.
44
44
4 Check the lead wires and connectors in indoor and outdoor units.
❑ Check that the sheath of lead wires is not damaged.
❑ Check that the lead wires are firmly connected at the terminal plate.
❑ Check that the wiring is correct.
55
55
5 Reference
• Condition of general cooling operation (Thermo. ON)
SWEEP .................. ON
Indoor fan speed .... HIGH